Portable cooler



FIG. 1 is a perspective view of a portable cooler showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof.

The right side view thereof is the mirror image of the left side view.

The ornamental design for portable cooler, as shown and described.